001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     *
017     */
018    
019    package org.apache.commons.exec;
020    
021    import org.apache.commons.exec.util.DebugUtils;
022    
023    import java.io.InputStream;
024    import java.io.OutputStream;
025    
026    /**
027     * Copies all data from an System.input stream to an output stream of the executed process.
028     *
029     * @author mkleint
030     */
031    public class InputStreamPumper implements Runnable {
032    
033        public static final int SLEEPING_TIME = 100;
034    
035        /** the input stream to pump from */
036        private final InputStream is;
037    
038        /** the output stream to pmp into */
039        private final OutputStream os;
040    
041        /** flag to stop the stream pumping */
042        private volatile boolean stop;
043    
044    
045        /**
046         * Create a new stream pumper.
047         *
048         * @param is input stream to read data from
049         * @param os output stream to write data to.
050         */
051        public InputStreamPumper(final InputStream is, final OutputStream os) {
052            this.is = is;
053            this.os = os;
054            this.stop = false;
055        }
056    
057    
058        /**
059         * Copies data from the input stream to the output stream. Terminates as
060         * soon as the input stream is closed or an error occurs.
061         */
062        public void run() {
063            try {
064                while (!stop) {
065                    while (is.available() > 0 && !stop) {
066                        os.write(is.read());
067                    }
068                    os.flush();
069                    Thread.sleep(SLEEPING_TIME);
070                }
071            } catch (Exception e) {
072                String msg = "Got exception while reading/writing the stream";
073                DebugUtils.handleException(msg ,e);
074            } finally {
075            }
076        }
077    
078    
079        public void stopProcessing() {
080            stop = true;
081        }
082    
083    }